Derivative Instruments - Impact on Statements of Income, Cash Flow Hedges (Details 2b) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Cash flow hedge gains and losses [Abstract]
Recognition of losses related to cash flow hedges in Income			$ (42)
Maximum length of time hedged in forecasted transactions			10 years
Cash Flow Hedging
Cash flow hedge gains and losses [Abstract]
Hedge ineffectiveness recrded directly in income	0	0	0	5
Total income statement impact	(34)	5	(63)	30
Cash Flow Hedging \| Interest rate contract
Cash flow hedge gains and losses [Abstract]
Derivatives - effective portion reclassified from AOCI to income	(14)	7	(41)	28
Hedge ineffectiveness recrded directly in income	0	0	0	5
Total income statement impact	(14)	7	(41)	33
Derivatives - effective portion recorded in OCI	(500)	140	(526)	20
Total change in OCI for period	(486)	133	(485)	(8)
Cash Flow Hedging \| Foreign exchange
Cash flow hedge gains and losses [Abstract]
Derivatives - effective portion reclassified from AOCI to income	(20)	(2)	(22)	(3)
Hedge ineffectiveness recrded directly in income	0	0	0	0
Total income statement impact	(20)	(2)	(22)	(3)
Derivatives - effective portion recorded in OCI	(12)	(12)	(116)	67
Total change in OCI for period	8	(10)	(94)	70
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Cash flow hedge gains and losses [Abstract]
Total change in OCI for period	(478)	123	(579)	62
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] \| Cash Flow Hedging
Cash flow hedge gains and losses [Abstract]
Derivatives - effective portion reclassified from AOCI to income	(34)	5	(63)	25
Derivatives - effective portion recorded in OCI	(512)	128	(642)	87
Total change in OCI for period	$ (478)	$ 123	$ (579)	$ 62

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

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-Name Accounting Standards Codification

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- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Before tax amount, net of reclassification adjustments, of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

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